package com.itheima.web;

import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 *
 */
@Slf4j
//@RestController
//@RequestMapping("/common")
public class CommonController {
    @Autowired
    private HttpServletResponse response;
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R upload(MultipartFile file) throws IOException {
        log.info(file.toString());
        String originalFilename = file.getOriginalFilename();//带文件后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));//截取后缀名
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String filename = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
            dir.mkdir();
        }
        //将临时文件转存到指定位置
        file.transferTo(new File(basePath+filename));
        return R.success(filename);
    }

    /**
     * 文件下载
     * @param name
     */
    @GetMapping("/download")
    public void download(String name){
        try {
            FileInputStream fis = new FileInputStream(new File(basePath+name));
            ServletOutputStream os = response.getOutputStream();
            response.setContentType("image/jpeg");
            /*int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fis.read(bytes)) != -1){
                os.write(bytes,0,len);
                os.flush();
            }*/
            IOUtils.copy(fis,os);
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
